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Running CouchApps on PouchDB in the browser using service workers

What is this?

A description of how to run an existing CouchApp on PouchDB in the browser using service workers - without any modifications to existing code being necessary! The best thing is that if service workers aren't available, the CouchApp will still run as normal: that is, online.

Demo

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Sequel.migration do
  up do
    run 'CREATE EXTENSION "uuid-ossp"'

    create_table :products do
      primary_key :id, {type: :uuid, default: Sequel.function(:uuid_generate_v4)}
    end
  end
end

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require File.expand_path('../../../../app/helpers/issue_helper', __FILE__)

describe "IssueHelper" do
  subject do
    Class.new do
      include Padrino::Helpers::OutputHelpers
      include Padrino::Helpers::TagHelpers
      include Magazineshop::IssueHelper
    end
  end

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module MyApp
  module CommonViewHelper
    def self.registered(app)
      app.helpers Helpers
    end
    alias :included :registered
    
    module Helpers
      def page_title(title="")
        @base_title = "Test Titke"

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source "https://rubygems.org"

gem 'puma'
gem 'sinatra'